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Question 9 (i)
A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. 12.12. Find:

(i) The total length of the silver wire required.

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Solution

Number of diameters = 5
Length of diameter = 35 mm
Radius=352 mm
(i) Total length of silver wire required = Circumference of the circle + Length of 5 diameter
=2πr+(5×35) mm
=(2×227×352)+175 mm
=110+175 mm=285 mm

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